Damp/mould problem could it be related to proximity of boiler?

[boolie]

I want advice on how to tackle this damp/mould problem. We've had this problem for over a year now.. Ive painted over it in the past but the 'black' keeps coming back. By the way we cant really smell anything. The damp/mould is behind some kitchen units near the boiler but seems to be going higher. The house is quite old (about 100 years) and there is a cellar. Pictures below with some further explanation.. anyone know how I can fix it?

Pics below with more info, summarised here

PIC 1 - So I've removed the doors from the units here.. you can see the mould / damp
PIC 2 - This is what it looks like with the units removed
PIC 3 - Grill removed from vent
PIC 4 - moisture reading from the blackest part doesnt show any significant reading
PIC 5 - Picture of cavity (taken from inside air vent)
PIC 6- Cellar section directly underneath. In the past I have noticed some water in that hole area in. Not sure where that water comes from because it's raining cats and dogs outside today but it looks pretty dry to me
PIC 7 - Outside section
PIC 8 - Outside section top
PIC 9 - Outside section - roof


PIC 1
So I've removed the doors from the units here.. you can see the mould / damp

PIC 2
This is what it looks like with the units removed

PIC 3
Grill removed from vent

PIC 4
moisture reading from the blackest part doesnt show any significant reading

PIC 5
Picture of cavity (taken from inside air vent)

PIC 6
Cellar section directly underneath. In the past I have noticed some water in that hole area in. Not sure where that water comes from because it's raining cats and dogs outside today but it looks pretty dry to me

PIC 7
Outside section

PIC 8
Outside section - top

PIC 9
Outside section - roof

 

[Bonni]

Mould is due to the result of a lack of ventilation and/or heat.

 

[ianmcd]

nothing to do with the position of the boiler

 

[boolie]

I'm gonna try relocating the tumble dryer to the cellar as that may be causing it - It does make the kitchen very warm.

Aside from that gonna treat the mould with mould cleaner and special anti-mould paint. Hopefully that will solve it.

https://www.toolstation.com/ronseal-3-in-1-mould-killer-spray/p39347
https://www.toolstation.com/ronseal-6-year-anti-mould-paint-25l/p86512

 

[Madrab]

Where does the tumble drier live and is it condensing or a hose vented type that is just blowing into the kitchen?

 

[boolie]

It's a condensing dryer and lives in the same room about 3 metres away (an L shaped room)